Removed a stale TODO in the agent code.
Removed a stale TODO in the agent code.

This TODO was written before the code below it handled the
optionality of the state `info` fields.

Review: https://reviews.apache.org/r/56424

craimbert/mesos,zmalik/mesos,Gilbert88/mesos,reneploetz/mesos,asamerh4/mesos,zmalik/mesos,kaysoky/mesos,Aman-Jain-14/customizedMesos,kaysoky/mesos,Aman-Jain-14/customizedMesos,zmalik/mesos,craimbert/mesos,craimbert/mesos,neilconway/mesos,andschwa/mesos,Aman-Jain-14/customizedMesos,Aman-Jain-14/customizedMesos,asamerh4/mesos,craimbert/mesos,jpeach/mesos,neilconway/mesos,chhsia0/mesos,chhsia0/mesos,asamerh4/mesos,verizonlabs/mesos,abudnik/mesos,neilconway/mesos,gsantovena/mesos,chhsia0/mesos,chhsia0/mesos,kaysoky/mesos,abudnik/mesos,zmalik/mesos,zmalik/mesos,abudnik/mesos,neilconway/mesos,neilconway/mesos,dforsyth/mesos,jpeach/mesos,reneploetz/mesos,dforsyth/mesos,neilconway/mesos,verizonlabs/mesos,abudnik/mesos,chhsia0/mesos,reneploetz/mesos,kaysoky/mesos,zmalik/mesos,gsantovena/mesos,craimbert/mesos,abudnik/mesos,verizonlabs/mesos,verizonlabs/mesos,yuquanshan/customizedMesos,zmalik/mesos,kaysoky/mesos,andschwa/mesos,asamerh4/mesos,yuquanshan/customizedMesos,andschwa/mesos,yuquanshan/customizedMesos,asamerh4/mesos,jpeach/mesos,gsantovena/mesos,chhsia0/mesos,andschwa/mesos,gsantovena/mesos,andschwa/mesos,dforsyth/mesos,Gilbert88/mesos,yuquanshan/customizedMesos,Aman-Jain-14/customizedMesos,verizonlabs/mesos,Aman-Jain-14/customizedMesos,Gilbert88/mesos,reneploetz/mesos,gsantovena/mesos,craimbert/mesos,jpeach/mesos,jpeach/mesos,Gilbert88/mesos,craimbert/mesos,abudnik/mesos,chhsia0/mesos,verizonlabs/mesos,reneploetz/mesos,reneploetz/mesos,abudnik/mesos,Aman-Jain-14/customizedMesos,kaysoky/mesos,Gilbert88/mesos,kaysoky/mesos,dforsyth/mesos,yuquanshan/customizedMesos,reneploetz/mesos,dforsyth/mesos,Gilbert88/mesos,neilconway/mesos,asamerh4/mesos,verizonlabs/mesos,dforsyth/mesos,dforsyth/mesos,gsantovena/mesos,jpeach/mesos,gsantovena/mesos,Gilbert88/mesos,andschwa/mesos,yuquanshan/customizedMesos,asamerh4/mesos,andschwa/mesos,jpeach/mesos,yuquanshan/customizedMesos